Sunhyoung Kwon

Low Complexity Layered Division Multiplexing for ATSC 3.0

In this paper, we propose novel transmitter and receiver architectures for low complexity layered division multiplexing (LDM) systems. The proposed transmitter architecture, which is adopted as a baseline technology of the Advanced Television Systems Committee 3.0, shares time and frequency interleavers, FFT, pilot patterns, guard interval, preamble, and bootstrap among different layers, so that the implementation of LDM receivers can be realized with less than 10% complexity increase compared to conventional single layer receivers. With such low complexity increment, we show simulation and laboratory test results that the proposed LDM system has significant performance advantage (3-9 dB) over traditional TDM systems, and maintains its performance up to the velocity of 260 km/h in mobile reception.

Flexible and Robust Transmission for Physical Layer Signaling of ATSC 3.0

The physical layer [layer-1 (L1)] signaling (L1 signaling) of Advanced Television Systems Committee (ATSC) 3.0 is studied. In the new digital broadcasting system, ATSC 3.0, L1 signaling is designed to be more efficient but still robust compared with preceding standards such as DVB-T2. We introduce the error protection scheme of ATSC 3.0 in detail. Especially advanced methods newly employed in ATSC 3.0 are investigated with regard to its purpose and benefit in comparison to conventional DVB-T2.

Simplified non-uniform constellation demapping scheme for the next broadcasting system

This paper proposes a simplified non-uniform constellation (NUC) demapping scheme for the next generation broadcasting systems which adopt NUC as an advanced modulation technique. The proposed scheme provides a reduced demapping complexity by considering only effective bits within a modulated symbol while the performance loss is negligible.

Framing and multiple-PLP structures for LDM-based next generation terrestrial broadcasting systems

In this paper, we present framing and multiple-physical layer pipe (PLP) structures for layered division multiplexing (LDM)-based next generation terrestrial broadcasting systems. As a framing structure, single-layer frames and multi-layer frames can be simultaneously transmitted by a time division multiplexing (TDM) approach. In addition to a conventional multiple-PLP strategy, which is basically time-divisioned, layer-divisioned multiple-PLP strategies are introduced in order to implement low complexity and high efficiency LDM systems. In the case that the cells of upper layer and lower layer are super-imposed, a practical consideration of lower layer cell indication is addressed. Performance analysis is given when multiple PLPs are serviced with different TDM and LDM configurations.

ATSC 3.0 Transmitter Identification Signals and Applications

In the ATSC 3.0 PHY layer standard, a transmitter identification (TxID) signal is defined in order to provide the identification of an ATSC 3.0 transmitter. TxID signal can also be used to find the co-channel and adjacent interference signals, to assist accurate location finding calculation, and to obtain the channel estimation for each transmitter, which can help local service (e.g., targeted advertisement) reception, as well as for emergency alert. For efficient use of spectrum and quality of service improvement, single frequency network (SFN) where all transmitters share a single RF channel is often implemented. The recently developed ATSC 3.0 physical layer standard has been designed to support SFN. For efficient designing, fine-tuning and operating an SFN, it is crucial to identify each transmitter, as well as to adjust transmitting power and emission time of each transmitter. This paper presents TxID for ATSC 3.0, and analyzes its detection performance under very low signal to noise ratio environments and other applications, such as location finding, and channel estimation etc. for each SFN transmitter.

Low complexity layered division multiplexing system for the next generation terrestrial broadcasting

This paper proposes a novel low-complexity layered division multiplexing (LDM) transmitter and receiver structures for next generation terrestrial broadcasting systems. The proposed LDM system not only has low complexity because it shares the OFDM-related chain, but also provides significant performance gain (4 to 6 dB) compared to traditional time division multiplexing (TDM) system.

ADT-Based UHDTV Transmission for the Existing ATSC Terrestrial DTV Broadcasting

In this brief, we propose an augmented data transmission (ADT)-based ultrahigh definition (UHD) television transmission system for the existing advanced television systems committee terrestrial digital television (DTV) broadcasting. The proposed system can support a rate of 12 Mb/s using a moving pictures expert group-2 (MPEG-2)-based DTV signal and a rate of 12.5 Mb/s using High Efficiency Video Coding (HEVC)-based DTV and ADT signals. By combining properly an MPEG-2-based DTV signal, an HEVC-based DTV signal and an HEVC-based ADT signal, 4K (3840 × 2160 ) UHD video can be served while providing backward-compatible high-definition video service.

Multiple Service Configurations Based on Layered Division Multiplexing

In this paper, we present multiple service configurations based on layered division multiplexing (LDM), which is adopted as a baseline technology of the Advanced Television Systems Committee 3.0 standard. Based on a two-layer LDM technology, a variety of multiple-physical layer pipe (PLP) configurations as well as physical layer framing is introduced depending on the choices of service scenario, time interleaving, and cell addressing. A performance analysis is provided when three different broadcasting services—robust audio, indoor/mobile, and high data rate services—are delivered through different PLPs when a number of broadcasting service scenarios is presented.

Field Test Results of Layered Division Multiplexing for the Next Generation DTV System

In this paper, we present field test results of a layered division multiplexing (LDM) technology for the next generation digital television system, and analyze the results in several scenarios such as rooftop, indoor, and mobile receptions. In order to evaluate performance of the LDM technology, the field strength or the reception power is measured for all considered scenarios. Furthermore, the threshold of visibility, the marginal reception power, and the erroneous second ratio are measured for fixed, indoor, and mobile receptions, respectively. The field test results show that LDM technology enables broadcaster not only to efficiently provide a variety of services (e.g., mobile, indoor, and stationary services) with different robustness within a single radio frequency (RF) channel but also to increase flexible usage of the RF channel.

Low complexity and high order two-dimensional non-uniform constellations for high capacity broadcasting systems

Non uniform constellations have been recently included in the new terrestrial broadcasting system ATSC 3.0, providing better performance than the uniform ones. However, for high order constellations, the complexity in the demapper grows as the number of constellation points do, being necessary to reduce the number of degrees of freedom in the constellation design process. The goal of this paper is to present a set of optimal high order non uniform constellations which provide higher gain than the ones proposed for the ATSC 3.0 system with low demapping complexity.